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Surface plasmon interferometer in silicon-on-insulator: novel concept for an integrated biosensor: Comment.

R Levy, S Ruschin

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    Neglecting radiation modes in waveguide calculations for biosensors leads to inaccurate sensitivity predictions. Including these modes significantly reduces the calculated sensitivity of silicon-on-insulator devices.

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    Area of Science:

    • Optoelectronics
    • Nanophotonics
    • Integrated Optics

    Background:

    • Surface plasmon interferometers on silicon-on-insulator (SOI) are proposed for integrated biosensing.
    • Accurate calculation of waveguide mode propagation and sensor sensitivity is crucial for device design.
    • Previous analyses may have overlooked the impact of radiation modes in short waveguide structures.

    Purpose of the Study:

    • To investigate the inaccuracies in calculating waveguide mode propagation and sensitivity by neglecting radiation modes.
    • To re-evaluate the sensitivity of a proposed SOI surface plasmon interferometer biosensor.
    • To understand the physical mechanism behind the influence of radiation modes in short waveguides.

    Main Methods:

    • Numerical calculations were performed to analyze waveguide mode propagation.
    • The study incorporated radiation modes into the sensitivity calculations.
    • Comparison of sensitivity values with and without considering radiation modes.

    Main Results:

    • Radiation modes cannot be ignored in short waveguide structures, contrary to potential prior assumptions.
    • Including radiation modes drastically reduces the calculated sensitivity from over 10,000 dB/RIU to below 1000 dB/RIU.
    • Optical power recapture by the output guide from radiation modes explains the reduced interference contrast and sensitivity.

    Conclusions:

    • Neglecting radiation modes leads to significant overestimation of biosensor sensitivity in short SOI waveguides.
    • Accurate modeling must include radiation modes for reliable performance prediction of integrated photonic biosensors.
    • The findings highlight the importance of considering all optical modes for short photonic device design.